History of Aviation, Rare Stamps and Postal History of the World, Part 1
Lot 193:
1985, John J. Audubon, American Ornithologist, 22c dark chalky blue, horizontal pair imperforated between stamps in horizontal strip of 11½ stamps (imperf between 10th and 11th) stamps, full OG, NH, VF and very scarce, Datz reported only 10 such pairs, C.v. $1,300, Est. $500-$700, Sc. #1863f
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